Yes, releasing MPRIS Tester 1.3 a day after 1.2 is a bit ridiculous, but Fred Emmott pointed out a serious flaw for a D-Bus interface tester program: the type for the MPRIS Version field was wrong. It should have been a struct of two uint16s, but instead I had it as two ints.
For safety, I’ve also specified that the status field is comprised of 4 int32s, rather than simply ints. I hear tell of one (C, admittedly) compiler that implements ints as 24 bits…